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Full text of "Practical Organic Chemistry"

PRACTICAL ORGANIC

a

Jreflux

It

It consists of a boiling-tube, through the bottom"1
stout platinum wire is  sealed, which  is intended

external
liquid   an<
bles     at
Above
layer,   -
deep,   of
The     obj
beads   is   t
the bubbles
vent superl
irregular
the side
condenser

to cornier* e l^ va.
pours given oil clUrjng
the boiling- A Beck-
mann thcrnlometer is
inserted tliroug^ the

mouth of the tube.
This thermometer is
similar in <^onst*~Uction
to that used for freez.
ing-point c|ete*"inma-
tions, but it l^as a
smaller Ui-ilb. The
boiling--tul:>*^ is placed
in the central cavity
of a hollow gla.ss or
porcelain jtxcket, \vhich
contains the same
liquid as tlie "boiling-
tube and is also pro-
vided with. t condenser.
This jaclcot prevents
radiation, fromtVie boil-
ing-tube.          It Is pro-
vided with two windows of mica. The jacket is c:li.xrnpecl on a
gauze ring supported on a square tray of asbestos plitced upon a

FIG. 32.